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If the first four terms of a sequence are (6,15,24,33), what can be a simple rule for (a_n)?

Answer and explanation

Correct answer: \(a_n=9n-3\)

The differences between consecutive terms are \(15-6=9\), \(24-15=9\), and \(33-24=9\), so this is an arithmetic progression. Its nth term is \(a_n=a_1+(n-1)d=6+(n-1)\times9=9n-3\). In option B, substituting \(n=1\) gives 15, so it does not match the first term. Exam tip: first find the common difference, then use \(a_n=a_1+(n-1)d\).

Related tags

SequencesArithmetic ProgressionNth TermCommon DifferenceLinear RuleSequences And ProgressionsMathematicsClass 9 Mcq

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